Double planked hull construction



June 27, 1939. A. J. HIGGINS l DOUBLE PLANKED HULL CONSTRUCTION Filed Dec. 5, 1938 Petented June 27, 1939 UNITED STATES PATENT OFFICEA 5 Claims.

This invention relates to a double planked boat hull construction and is concerned particularly with means and a method of construction for making a hull of this type water-tight.

Double planking is employed for the most part in light high speed hulls which are subjected to excessive vibration and to weaving, due to their inherent lightness. v

It is customary to run -the inner and outer planks in different directions so as to cross the joints and as the usual thinness of the planking makes it impracticable to caulk the joints between the planks, recourse is had to a canvas interlining-v which is laid between the inner and outer planking and preferably cemented to either oneV or both of the plank surfaces by marine glue, asphalt or other suitable water-proof adhesive. Such canvas lamination applied in the ordinary manner merely covers the joint between theinner 'side and bottom plank panels or'the joint between the'bottom planking and the keel.

Inasmuch as the side planks are customarily secured in common to the ribs and the bottom planks are secured in common to transverse ribs or supports, v,the side and bottom planking may be considered as panels which in the act of weaving move as a whole, producing the maximum relative movementparticularly at the chine and also at their juncture with the keel. Due to this relative movement the canvas-interliner or lamination 4as ordinarily applied wears along the chine and keeljoints and' soon goes into slits,l creating leaks which are practically impossible to repair.

The present invention has for its principal object to provide a double planked hull construction employing the intermediate canvas lamination not merely as a cover for the joints, but extending throughthe joint between the outer bottom and side planking yat thel chine, and through both'faces of the rabbet joint between 4"the outside planking and the keel.` 'I'hus the outer chine joint and the keel joint are caulked yhaving a marginal portion which lapsv the inner.y

by a textile packing compressed between the abutting surfaces of the joints, for the full width of said abutting faces, and which cannot lwear through or go intojslits, andtherefore ensures a permanent water-tight construction. ,i

Another `object 'isto provide rin `Va double planked hull construction ofthe type described an interliner between the inner and side planks "bottom plankadjacent the chinejoint and an interlinerV between the inner and outer bottom' planking. which extends through the joint between the outer side plank panel and the bottom plank panel and having a marginal portion whih laps upon the side plank, panel, said interliners being adhesively united to the surfaces which they contact, forming a pocket in which the chine margin of the side plank panel is adhesively seated and said interliners being mutually united and therefore of double thickness throughout the area in which they overlap beneath the chine.

Other objects of the invention will appear as the following descriptionof a preferred and practical embodiment thereof proceeds.

In the drawing which accompanies and forms a part of the following specification, the sole figure is a perspective view, partly in section of a boat hull embodying the principles of the present invention.

l Referring in detail to the structure illustrated in this figure, the numeral 'I represents the keel, 2 being the chine logs, 3 and 4 representing respectively the inner and outer vside plank panels regarded as a whole, while the numerals 5 and 6 represent respectively the;inner and outer bottom plank panels, likewise regarded' as a whole, l the individual planks in the inner and outer side plank panels being designated respectively by the characters 'l and 8, while the individual planks in the inner and outer bottom plankpanels are'denoted by the reference characters 9f and I0.

The figure represents the boat hull in whichY the inner and outer `side planks run diagonally in opposite directions so as to cross the joints while the inner bottom planks 9'extend diagonally and the outer bottom planks I 0 extend longitudinally of the keel in the interest of structural -stiness as well as tocross the joints bearrangement of the planking as described is. a matter of option insofar as the present invention is concerned.

The keel l is provided` with inner and outer rabbets ll and I2 respectively," receiving the adjacent ends or edges of the inner and'outer bottom planking. Thends or edges of the inner and outer side planks 1 and `8v abut' at against the adjacent edges of the inner and outer bottom`plank panels, the` portions of the inner, side and bottomplank panels which lie against r the chine logs 2 being'secured'to said vchine logs.

In the construction of the hull a sliver or yarn of fcaulking or a length-of flat wick packing is preferably place-d against the overhanging face of the inner rabbet Il andv the'ends or edges of the inner planks 9 are screwed against said face of said rabbet putting thecaulkingf or packing Vtween the inner and outer bottom planks. The

under compression. This gives the initial watertight seal at the keel and is of itself common practice and not per se to be regarded as a dominant feature of the invention.

The invention involves theV employment between the two layers of planking of the two flexible textile sheet interliners I3 and Il which will ordinarily be of canvas. Canvas is of course not inherently water-proof, but in its use as an interliner the canvas is especially treated to render it water-proof either by coating the canvas on one or both sides with a suitable water-proof adhesive such as marine glue or asphalt or by coating the inner planking with the adhesive and applying the canvas which will absorb or take up enough of the adhesive to render it water-proof. The canvas is then preferably but not necessarily coated with adhesive on the other side before applying the outer planking. The present invention contemplates the employment of two of the 4flexible textile sheet interliners, the interliner I3 starting somewhere along the side of the hull,

preferably at the top or sheer and being folded around the chine angle I5 terminating in a marginal overlap I6 which is glued or otherwise united to the inner bottom planking. This interliner covers the joint between the inner side and inner bottom plank panels-3 and 5. The other interliner I4 preferably starts at the keel and it will be observed that it lines both faces of the outer rabbet I2 as indicated at II and I8 so that when the edge of the rst or garboard plank I! is in place'in the rabbet, the interliner Il lines both faces of the joint between the garboard plank and the keel. Said interliner Il extends throughout the space between the inner and outer plank'panels, folds around the outer edge 20 of the lower edge of the side plank panel 4 and has the marginal overlap 2| which is glued.

or otherwise united to the lower portions of the side plank panel. It will be observed that of necessity the interliner I4 passes through the Joint between the outer side and bottom panels being contacted by the abutting faces of said joint.

It will likewise be observed that the lower portion of the outer side plank panel l is seated in a pocket formed between the interliner I3 and the `interliner Il, all surfaces of which pocket are adhesively united to the outer side plank panel.V It will also be observed that the interliner I4 crosses the marginal overlap I6 of the interliner I3 forming a seal of double thickness beneath the chine, it being understood that the coinciding layers of interliner are adhesively united in a water-tight manner.

Thus a most emcient joint is formed, in which it is practically impossible that leakage can take place through cutting or wearing of the interliner fabric dueto weaving-and in which a water seal of double eiiiciency is provided, one phase of which comprises the side interliner Il which covers the joint between the inner side and bottom plank panels and the other phase of which is provided bythe bottom interliner I4 which extends through the joint between the outer side and 'bottom plank panels, any possible leakage through this seal being further barred by the double thick joint, of relatively large width 'formed by the mutually contacting areas of both o1' said interliners. With reference to the keel it will be understood that the primary seal represented by the compressed packing between the Inner bottom pl'ank panel and the inner rabbet `is reinforced by the seal formed by the extension of the interliner I4 through both faces of the outer rabbet and in compression between said faces and the adjacent portions of the garboard plank I8.

For the protection of the marginal overlap 2| of the interliner Il which appears on the outer side of the outer plank panel, an annular shoe 22 is provided which conforms to the chine angle 'throughout the length oi the hull, being suitably secured to the outer side and bottom plank panels and having a flange 23 wide enough to conceal and protect the overlap 2i.

While I have in the above description defined what I believe to be a preferred and practical embodiment of my invention, it will be understood to those skilled in the art that the specific details of construction and the arrangement of the parts as shown and described are to be regarded as illustrative and not as restricting the scope of the invention as defined in the appended claims.

What I claim is:

1. Double planked boat hull construction comprising inner side and bottom plank panels and outer side and bottom plank panels, the respective inner and outer plank panels making abutting joints at the chine, a water-tight flexible sheet interliner between the inner and outer side plank panels, folded about the inner chine angle and having a marginal lap on the inner bottom plank panel so as to cross the joint between said inner side and bottom plank panels, and a watertight flexible sheet interliner between the inner and outer bottom plank panels extending between the abutting faces of the joint between the outer side and bottom plank panels, folded about the lower edge of the outer side plank panel and having a marginal portion lapping said outer side plank panel.

w 2. Double planked boat hull construction comprising inner side and bottom plank panels and outer side and bottom plank panels, the respective inner and out er plank panels making abutting joints at the chine, a water-tight flexible sheet interliner between the inner and outer side plank panels, folded about the inner chine angle and having a marginal lap on the inner bottom plank panel so as to 'cross the joint between the inner side and bottom plank panels, a water-tight flexible sheet interliner between the inner and outer bottom plank panels extending between the abutting faces of the joint between the outer side and bottom plank panels, folded about the lower edge of the outer side plank panel and having a marginal lap on the outer side plank panel, and a protective angular shoe conforming to the outer chine angle having a flange overlying the marginal lap of the last mentioned interliner.

3. Double planked boat hull construction comprising inner side and bottom plank panels and,

outer side and bottom plank panels, the respective inner and outer plank panels making abutting joints at the chine, a water-tight flexible sheet interliner between the inner and outer side plank panels. folded about the innerchine angle and having a marginal lap on the inner bottom plank panel so as to cross the joint between the inner side and bottom plank panels, a water-tight flexible sheet interliner between the inner and outer bottom plank panels, contacting the first mentioned interliner throughout the area of the said marginal lap of said ilrst mentioned inter-V liner, said second mentioned interliner extending between the abutting faces of the joint between the outer side and bottom plank panels, folded about the lower edge of the outer side plank panel l '9,168,908 and lapping the outer side plank panel, said interliners being in adhesive contact with the surfaces which they engage, and forming a Docket receiv' ing the lower marginal portion of the outer side plank panel.

4'. Double plank'ed boat hull construction comprising inner side and bottom plank panels and outer side and bottom plank panels, the re-rw spective inner and outer plank panels making wbutting joints at the chine, a keel having stepped inner and outer rabbets. receiving respectively, the keel edges of the inner and outer bottom plank panels, a water-tight flexible. sheetinterliner between the inner and youter side plank panels, folded about-the inner chine angle and having a amarginal lap on the inner bottom plank panel so edge of rabbet, and on the other hand extendingbetween lower edge of the outer side plank panel and as to cross the joint between the inner side and bottom plank panels, and a water-tight flexible sheet interliner between the inner and outer bottom plank panels extending, on the one hand between t faces of the outer keel rabbet and the e outer plank' panel which nts in said the abutting faces oi' the joint between the outer side and bottom plank panels, folded about the having a marginal lap on the outer side panel.

5. Double planked boath'ull construction com prising inner side and bottom plank panels and outer side and bottom plank panels, the respec" tive inner and outer plank panels making abutting joints at the chine, a keel having stepped inner and outer rabbets,rece iving respectively the keel edges of the 'inner and outer bottom plank panels,4 said inner bottom plank panel ,being se- "compessively" againstv the upper face of the inner rabbet, with the water-excluding packing intervening; a water-tight iiexible sheet interliner between the inner and outer side plank f panels, folded about the chine angle and having `panel setting in said rabbet, and on the other hand extending between the abutting faces of the joint between the outer side and bottom plank panels, foldedabout the lower edge of the outer side plank panel and lapping on the outer side plank panel, said interliners being in adhesive contact with ther surfaces which they engage.

' ANDREW J. HIGGms.

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